The radius of curvatrure of a thin plano...

The radius of curvatrure of a thin plano-convex lens is `10 cm ` (of cured surface) and the refractive index is 1.5.If the plane surface is silvered,then it behaves like a concavemirror of focal length

A

20 cm

B

15 cm

C

10 cm

D

5 cm.

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